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Condensed Consolidated Statements of Cash Flows (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2015
Statement of Cash Flows [Abstract] |
Non-cash additions to real estate, Accounts payable and accrued expenses | $ 1,069,965 land_AdditionsToRealEstateIncludedInAccountsPayableAndAccruedExpenses
Non-cash additions to real estate, contingent consideration, included in Other liabilities, owed | $ 700,000 land_AdditionsToRealEstateIncludedInContingentConsiderationOwed

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- Definition Additions to real estate included in accounts payable and accrued expenses. + References No definition available. + Details
Name: | land_AdditionsToRealEstateIncludedInAccountsPayableAndAccruedExpenses
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Additions to real estate included in contingent consideration owed. + References No definition available. + Details
Name: | land_AdditionsToRealEstateIncludedInContingentConsiderationOwed
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration